I began by cleaning the MAF and clearing the code. It returned several days later.

Next I replaced the MAF and cleared the code. Again returning several days later.

It was then that I noticed the 3-4 inch diameter hose from the intercooler to the turbo was no longer seated correctly. The alum fitting on the turbo end was not inserted all the way into the corresponding fitting. The spring clip's bottom section was missing. I replaced the spring, cleared the code, but again the MIL returned.

Now I noticed that the alum fitting on the end of the hose no longer had it's little tabs that hold it behind the spring clip I already replaced. I replaced the hose, it clipped in just fine now, but as you suspected, the MIL came back again.

I'm at a bit of a loss.. No blockages on the intake side, air cleaner or snow screen. The intake has never been cleaned but we run the car agressively regularly and run DieselService full time.

Ok, I've searched and searched the forum, but really found nothing about a P0101 that doesn't go along with poor performance. Our '05 seems to continue to run just fine other than a very slight hesitation my wife reports. So slight I can't even detect it, but I don't drive the car full time.

I've seen some talk about a clogged intake. I've seen the cleaning done at a GTG and it didn't look fun so I'd sure like to really know that's the issue before pulling it apart.

just solved same issue on my PD. the wire from pin 4 in the MAF connector had an intermittent connection to ECU connector.
At the least , reseat the ECU connector . at most ohm out for continuity between both ends of wire

just solved same issue on my PD. the wire from pin 4 in the MAF connector had an intermittent connection to ECU connector.
At the least , reseat the ECU connector . at most ohm out for continuity between both ends of wire

thanks, I'll check that... Do you recall the ECM pin? I 'spose I can RTFM, can't I? The ECM has been touched in this car when it was RC'd, but it was years ago... hmmmm... Could it be that easy? Here's hoping! thanks!

pin 40 on big T94 pin connector. it should have a red/green wire on it. make sure you count the pins in the right direction to locate pin 40. it is supposed to have continuity with a pin in the MAf, i think it's 4, but check for the same wire color.

It could also be a loose T94 connector or pin 40 may be damaged. make sure the T94 engages and locks in place

pin 40 on big T94 pin connector. it should have a red/green wire on it. make sure you count the pins in the right direction to locate pin 40. it is supposed to have continuity with a pin in the MAf, i think it's 4, but check for the same wire color.

It could also be a loose T94 connector or pin 40 may be damaged. make sure the T94 engages and locks in place

Thanks! I pulled both connectors last night, cleaned them a bit and used some dielectric grease. (hopefully it likes that). I could not find the pinout in the FM so I closed it back up and reset the MIL. I'll check continuity next if it comes back.. thanks for the pin numbers...

The connector seemed to go back just fine and the lock seemed to work..

Still no joy, ohmed out the connections just fine. Wiggling the wires didn't seem to matter. When following the bouncing ball that is the air input I notied that the right inner fender had a pretty big "pizza" slice out of the front section. Looks like it came loose and rubbed the tire. I wonder if something got thrown into the intercooler or its plumbing. I'll have to get it on the lift and take a closer look...

Believe or not but recently I found that camshaft wear can do this.
I had BRM that customer was having same problem even with new MAF and new camshaft fixed problem.
I one more guy told me on his Beetle 2004 BEW it was a same thing.After cam replacement problem was gone.

Believe or not but recently I found that camshaft wear can do this.
I had BRM that customer was having same problem even with new MAF and new camshaft fixed problem.
I one more guy told me on his Beetle 2004 BEW it was a same thing.After cam replacement problem was gone.

thats an expensive fix

so far got a new clip and hose fix kit - the engine light dont come on anymore